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Net Income Per Share - Additional Information (Detail) (2.25% Convertible Senior Notes Due 2019 [Member])	0 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Jun. 30, 2014
2.25% Convertible Senior Notes Due 2019 [Member]
Net Income Per Share [Line Items]
Debt instrument, interest rate	2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember	2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember	2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = meli_TwoPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandNineteenMember
Debt instrument, maturity year	2019	2019

X

- Definition

Debt Instrument Maturity Date Year

+ References

No definition available.

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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